Ok so I just built a new computer, before hand I was playing off my CD on my laptop and it worked fine online finding games and with hamachi playing with friends via direct join. However putting the CD in the the desktop and the patching ends in this error:
"The online lobby system has disconnected. There may be connection issues between you and the online lobby servers, check your internet connection, firewall and router."
I cant play any type of multiplayer game. I don't use windows firewall and AVG has it as an exception. Help. :(